/*
 *  Copyright 2008-2010 the original author or authors.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  under the License.
 */
package org.openaecfm.spf.model;

/**
 * The dollor parameter.
 * @author Qiu Kuining
 */
public class DollarParameter implements UntypedParameter {

    private final static DollarParameter instance = new DollarParameter();

    private DollarParameter(){}

    public static DollarParameter getInstance() {
        return instance;
    }

    @Override
    public String toString() {
        return "$";
    }

    /**
     * Get the NodeType of DollarParameter.
     * @return
     */
    @Override
    public NodeType getNodeType(){
        return NodeType.DOLLAR;
    }

	@Override
	public void addChild(Node n) {}
}
